1. It has 'funk' in the name2. you can get silly colours3. you don't have to oil the pads4. It's easier to get the chanter airtight. This is the main Good Thing. With leather pads you pad up the chanter and then spend some time carefully tweaking the ends of the keys until it all seals nicely. With the funky foam you pad up the chanter and then go watch tv for an hour while the pads mould themselves to the correct shape.

Let's see how long it lasts though - I've seen chanters with leather pads still good after 50 years.....

Wow that stuff is great, not a single leak. Chanter just needs final tuning. Have to build a manometer for that I guess. Hmmm what to make next? Ideas anyone? A G set maybe? I need more practice key making, funny, it the little ones that are the trickiest.